Donor-Glycolated Quinoidal Polymers Enable Fast N-Type Organic Electrochemical Transistors

Area of Science:

• Materials Science
• Organic Electronics
• Polymer Chemistry

Background:

• Stable n-type organic mixed ionic-electronic conductors are crucial but scarce.
• Existing materials often suffer from poor stability or slow charge transport.
• Developing new materials is essential for advancing organic electronics.

Purpose of the Study:

• To design and synthesize a novel polymer for efficient n-type organic mixed ionic-electronic conduction.
• To investigate the material's performance in organic electrochemical transistors (OECTs).
• To explore its potential for bioelectronic circuits and complementary logic.

Main Methods:

• Synthesized a glycolated bithiophene donor and quinoidal bifuran-dione acceptor polymer (PQ-gT).
• Fabricated planar and vertical organic electrochemical transistors (OECTs).
• Investigated charge transport properties, switching speeds, and device stability.

Main Results:

• PQ-gT exhibited high mixed conduction (µC* = 10.9 F cm^-1 V^-1 s^-1) and sub-millisecond switching in planar OECTs.
• Partial substitution improved conduction (µC* = 21.5 F cm^-1 V^-1 s^-1) but slowed switching.
• Demonstrated a stable, single-material complementary inverter with high gain operating up to 200 Hz.

Conclusions:

• The donor-glycolated quinoidal strategy yields intrinsically fast, aqueous-stable n-type organic conductors.
• This approach significantly advances the performance of OECTs and bioelectronic devices.
• The developed materials are promising for next-generation flexible and biocompatible electronics.